Sodium Iodide → 6-Benzyloxy-1-[(S)-2-(tert-butyldimethyl-silanyloxy)-propyl]-1H-indazole

Participants

Reaction Steps

To a mixture of (S)-1-(6-benzyloxyindazol-1-yl)-propan-2-ol (2.03 g, 7.20 mmol) in anhydrous THF/DMF (100 mL/35 mL) under nitrogen was added sodium hydride (60% in mineral oil, 0.40 g, 10.0 mmol). After 30 min tert-butyl-chloro-dimethyl-silane (1.52 g, 10 mmol) and a catalytic amount of NaI were added and the mixture was stirred overnight at ambient temperature. Additional NaH (5 mmol) and tert-butyl-chloro-dimethyl-silane (5 mmol) were added to the reaction mixture, which was stirred for 6 h. The reaction mixture was evaporated to a residue that was mixed with a saturated aqueous solution of sodium bicarbonate and extracted with ethyl acetate (2×200 mL). Purification by chromatography (silica, EtOAc/hexane) gave an oil (2.81 g, 99%).

Provenance & Evidence